Ink.



v UNITED sTATEs PATENT oFFIoE.

ROBERT W. HooHsrErranR, or

Specification of Letters lfatent.

Patented July 20, 1909.

Application fiied December 1 ,'1901,.Ser1a1No. 86,062,. Renewed October 18, 1905. Serial No. 282,592

'1' '0 all whom it may concern:

, Beit known that 1, ROBERT W.'HooHs'rnT- TER, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented a certain new land useful Improvement in Ink, of

which the following is a full, clear, and exact description.

Myimprovement relates to inks to be used on a mimeograph, or any machine of similar character.

The ob ect of my invention 1s to produce anvink which will remain moist in the pad slowly drying ink is used, altl'io 'igli it-will. not clog the pad and waxed stencil, and will:

freely flow through them, it dries so slowly on the paper that the printedsheets cannot be thrown immediately after each operation,

one. upo11-t l1e other, beeause the ink being moist will cause the sheets to smudge.

Variousinks have been tried to overcome the above" difficulties. For example, a mimeograph'ink consisting of thin printers ink mixed wlth Vaseline has been iised with an ordinary hand mimeograplnjbut this ink cannot be used on an oselllating mimeograph for the reason that it will not draw evenly and continuouely through the pad by means of capillary attraction, as is necessary in such a machine and will leave an oily outline to the letters on the paper. Again printers inkhas' been mixed with an emulsion of glycerin and borax (borated gylcerin) or other alkaline agents and glycerin. This ink will draw through the pad but will dry -too slowly on the aper,

My improved in 1e especially adapted for use in an oscillating mimeograph or machine of similar character, 'in which the ink is drawn through the pad and through the waxed stencil by: means of capillary attraction; v

In the case of inorganic pigments, and carfbon black pigments, carrying out my inf vention, I grind the pigments in a mixture of glycerin and Turkey red oil. Ground with glycerin alone, the result is a fairly good quality of ink, but ground in a mixture of the two, I find that an ink is produced which not only flows easily and readily through the pad without clogging, but dries rapidly on the paper, thereby fulfilling all the requirements I of an ink to be used on an oscillating mimeograph. i

As a specific example of my improved ink I give the following proportionsz-Take thirty parts by weight of dry barium sulfate, ten parts by weight of purpleiR. pigment on barium-sulfate base, five parts purpleB pig ment on barium sulfate base, and twenty-six Earts of glycerin, all the parts by weight.

rind all ingredientsabove mentioned to gether until erfectly free from grit. To the above add t irty-five and one half parts by weight, of Turkey red oil, and eighteenparts by weight of glycerin. This produces the ink. The body of the ink as described can readily be variedby either increasing the pigment or the varnish, asthe case may require. As for example, for very warm climates, more pigment must be used: otherwise the resulting'ink would be too thin.

I The use of the Turkey red oil increases the rapidity with which the ink will dryuponthe paper, it appearing to simply draw the ink right into the paper, VJith glycerin alone this would not be the case, its action being slower than that of the Turkey red oil. Turkey red oil is a sulfonatedcastoroil and its essential quality is that it will readily mix with glycerin and never so arate from it or settle out on standing. ther. sulfonated oils have this characteristic and may be used in place of the Turkey red oil. I

therefore do not limit myself to the use of Turkey red oil alone.

Organic or lake pigments are usually constructed with alumina white as their base. So constructed, if ground with glycerin, an ink would be produced which could not be used on an oscillating mimeograph or machine of similar character, because it would soon become stiff and jelly-like on standmg and could not then draw through the pad and'stencil. This .is due to the chemical reaction of the glycerin with the alumina white. I find however, that if barium sulfate is used as a base in constructing pigments from organic dyes (as for example purple green and red dyes) they may be ground with glycerin in makin stencil inks without the above named o jection. A fairly good quality of mimeographink is thus produced. I prefer however, to grind such pigments in a mixture of glycerin and Turkey red oil as described in the case of inorganic and carbon black pigments, andI find that in this way an ink is produced which has all the requisites of an ink for an oscillating mimeograph or device of a similar character. 1 r i In ,the case of organic pigments, Iprefer to use in addition a little glucose, because the organicvpigments are slightly soluble in the vehicle, which is the mixture of glycerin and Turkey red oil, thus causing the ink to spread on the paper and to produce what is technically known as bleedlng. The glucose prevents this to a great extent The essential quality of the barium sulfate which is used as the base of organic pig ments in constructing them for use in the formation of my improved ink, is that it will not enter into a chemical reaction with glycerin. I therefore do not limit myself to the use 'of amorphous or precipitated barium sulfate alone as the base of pigments to be used in the formation of my improved ink. Any other suitable substance which will not combine with glycerin chemically'as for exganic ample barites or china cla may be used in its place and as its equiva ent.,

By grinding any of the pigments above re ferred to with Turkey red oil or with any other sulfonated oil, alone, I am also enabled tokget a fairly good quality of mimeograph 1n i I 1 Having thus described my invention, what I desire to claim as new and to cover by Letters Patent, is: v

1. An"mproved ink, consisting of a pig- .Inent ground in a mixture of glycerin and a l sulfonated oil, substantially as specified.

2. An improved ink consisting of an origment insoluble in glycerin, and

Whose ase will not enter into a chemical reaction with g ycerin, ground in glycerin, substantially as described.

' 3. Animproved ink consisting, of an organic pigment constructed on a ase of barium su fate, round in glycerin, substan-- tially as described.-

4. An'irnproved ink for use with waxed stencil sheets, consisting of an organic pigment, Whose base will not enter into a chemical reaction with glycerin, ground in glycerin, substantially as described. 7

5.- An improved ink consisting of a pigment ground in a mixture of glycerin and Turkey red-oil, substantially as described.

6. An improved ink consistin of an organic pigment, constructed-on a ase which specified.

8. An improved ink consisting of an organic pigment, constructed on a base ofbarium sulfate ground in a mixture of glycerin and Turkey-red oil, substantially as and for.

the purpose specified.

9. An improved ink consisting of an organic pigment, constructed on a base of barium sulfate,- ground in a mixture of glycerin and Turke glucose, su stanti'ally as and for the purpose specified.

I Turkey red oil, substantially as and for the purpose red oil, and'a'small amount of v 10. An improved ink consisting of an organic pigment, constructed on a base which not enter into a chemical reaction with glycerin, (ground in a mixture of glycerin and sulfonate oil, and a small amount of 'glucose, substantially as and for the purpose specified. Q r i ROBERT W. HOCHSTETTER. Witnesses:

EDwnRD HAAT,

GEORGE HEIDMAN. 

